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Same here. It has been detected by support for ticket 7447.

I was able to already do a reboot. No matter what I do, since i switched to bypass mode and back, IPv6 wont work anymore.

Hi Sy
Same behaviour like before. OPNsense is able to ping devices on the internet, clients behind OPNsense are not. Unfortunately IPv6 isn't working again after switching back to previous settings, I think I have to reboot OPNsense (which will be done at 23:59  ;) )

Update:
I did some tests by pinging around and capturing it using tcpdump:

- Ping from firewall to VPS: OK, I can see ICMPv6 echo-request/-reply on VPS and firewall.
- Ping from client behind firewall to VPS: I can see ICMPv6 echo-request arriving on VPS and I can see an ICMPv6 echo-reply going out from VPS. Nothing arrives on firewall on WAN from VPS.

As soon as Zenarmor is disabled or running in passive mode, pinging from behind firewall works fine.

I have the same issue. As long as Zenarmor is not running in Passive Mode, I do not get IPv6 connectivity for clients behind OPNsense. Only firewall itself is able to use IPv6. As soon as Zenarmor is running in Passive Mode, IPv6 works as expected. I'll try to get some more details later and add it to this thread.